MIAMI and NES-ZIONA, Israel, April 24, 2013 /PRNewswire/ -- OPKO Health, Inc. (OPK) and PROLOR Biotech, Inc. (NYSE MKT: PBTH) today announced that the companies have signed a definitive merger agreement under which OPKO will acquire PROLOR, a biopharmaceutical company focused on developing and commercializing longer-acting proprietary versions of already approved therapeutic proteins, in an all-stock transaction. Under the terms of the agreement, which has been approved by the boards of directors of both companies, holders of PROLOR common stock will receive 0.9951 shares of OPKO common stock for each share of PROLOR common stock. Based on a price of $7.03 per share of OPKO common stock, the transaction is valued at approximately $480 million, or $7.00 per share of PROLOR common stock. The companies expect the transaction to be completed during the second half of 2013. Closing of the transaction is subject to certain conditions including, the approval of OPKO's and PROLOR's stockholders and other customary closing conditions.

PROLOR's long-acting version of human growth hormone, hGH-CTP, has successfully completed four clinical trials, including a Phase II trial in adults with growth hormone deficiency (GHD). The trials showed that hGH-CTP has the potential to reduce the required dosing frequency of human growth hormone from the current standard of one injection per day to a single weekly injection. hGH-CTP demonstrated a good safety and tolerability profile in these clinical trials. A Phase II trial in children with GHD is currently ongoing, and a Phase III trial in adults with GHD is planned to begin in the second quarter of 2013. Recombinant human growth hormone (hGH) is used for the long-term treatment of children and adults with GHD due to inadequate secretion of endogenous growth hormone. hGH-CTP has been awarded orphan drug designation in the U.S. and Europe for both adults and children with GHD.

PROLOR's long-acting version of human growth hormone and long-acting clotting factors in preclinical development for hemophilia are based on the company's proprietary CTP technology. When attached to a therapeutic protein, CTP significantly extends the length of time the protein remains active in the body. Clinical and preclinical studies show that the CTP technology appears to be safe and effective in extending the duration of all proteins tested to date. CTP was identified at Washington University in St. Louis and is exclusively licensed to PROLOR for all proteins and peptides, except for four endocrine proteins that are licensed to Merck. One of these, the long-acting fertility drug Elonva®, is already marketed by Merck & Co. in Europe.

"This transaction is consistent with OPKO's stated objective of broadening our portfolio of market-transforming therapies in selected specialty markets," commented Dr. Phillip Frost, OPKO's Chairman and Chief Executive Officer. "With the inclusion of PROLOR's pipeline, OPKO will have four significant products in Phase III clinical development and a robust pipeline of important therapeutic and unique diagnostic products in various stages of development. PROLOR's drug-product candidates for growth hormone deficiency, hemophilia, obesity and diabetes, along with its broadly applicable technology platforms and efficient research and development center are highly valuable assets that will complement OPKO's strategy."

"We believe this transaction recognizes the value we have created at PROLOR and provides our shareholders with attractive economic terms, as well as the opportunity to continue to share in the success of the combined company," commented Shai Novik, President of PROLOR. "We believe that OPKO's track record of commitment to innovation and growth, along with its diversified portfolio of innovative therapeutic and diagnostic products, growing international presence, ongoing investments in commercial infrastructure and highly experienced management team make this combination an excellent fit for PROLOR."

"Leveraging the combined resources of both companies not only strengthens our various development programs, but also underscores our commitment to providing patients with next-generation therapies that may improve their health and quality of life," added Dr. Abraham Havron, Chief Executive Officer of PROLOR.

PROLOR will host a live teleconference and webcast with senior management and a representative of OPKO management to discuss the acquisition on Thursday, April 25, 2013 at 8:30 a.m. EDT. To participate in the conference call, please dial toll-free at 1-866-652-5200 (U.S.), 1-855-669-9657 (Canada), 1-80-9213284 (Israel) or at 1-412-317-6060 for other countries. After placing the call, please tell the operator you wish to join the PROLOR investor conference call. A replay of the conference call will be available through May 1, 2013 at: 1-877-344-7529 (U.S.) and 1-412-317-0088 (international). Ask for conference number 10028297.

Alternatively, the live webcast of the conference call and slide presentation can be accessed via PROLOR's website at www.prolor-biotech.com. Windows Media or Real Player will be needed to access the webcast. The webcast will be available on PROLOR's website for at least 90 days.

About OPKO Health, Inc.

OPKO is a multinational biopharmaceutical and diagnostics company that seeks to establish industry leading positions in large, rapidly growing markets by leveraging its discovery, development and commercialization expertise and novel and proprietary technologies. For more information, visit http://www.opko.com.

ABOUT PROLOR BIOTECH, INC.

PROLOR Biotech, Inc. is a clinical stage biopharmaceutical company applying unique technologies, including patented CTP technology, primarily to develop longer-acting proprietary versions of already approved therapeutic proteins that currently generate billions of dollars in annual global sales. The CTP technology is applicable to virtually all proteins. In addition to its long-acting version of human growth hormone, which successfully completed a Phase II clinical trial, PROLOR is also developing long-acting versions of Factor VIIa and Factor IX for hemophilia and a GLP-1/Glucagon dual receptor agonist peptide for diabetes and obesity. For more information, visit www.prolor-biotech.com.

ADDITIONAL INFORMATION AND WHERE TO FIND IT

This communication does not constitute an offer to sell or the solicitation of an offer to buy any securities or a solicitation of any vote or approval nor shall there be any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. In connection with the proposed merger between PROLOR and OPKO, OPKO will file with the Securities and Exchange Commission (the "SEC") a Registration Statement on Form S-4 that will include a proxy statement of OPKO and PROLOR and a prospectus of OPKO. Stockholders of OPKO and PROLOR are urged to read the joint proxy statement/prospectus regarding the proposed transaction when it becomes available, as well as other documents filed with the SEC, because they will contain important information. Stockholders of OPKO and PROLOR will be able to obtain a copy of the joint proxy statement/prospectus, as well as other filings containing information about PROLOR and OPKO, without charge, at the SEC's website (www.sec.gov). Stockholders of OPKO and PROLOR may also obtain copies of all documents filed with the SEC, without charge, by directing a request to Shachar Shlosberger, PROLOR Biotech, Inc., 7 Golda Meir Street, Weizmann Science Park, Nes-Ziona, Israel 74140, telephone (+972) 8-930-0051, or Steven D. Rubin or Juan F. Rodriguez, OPKO Health, Inc., 4400 Biscayne Blvd., Miami, Florida, telephone (305) 575-4100.

Safe Harbor Statement

This press release contains "forward-looking statements," as that term is defined under the Private Securities Litigation Reform Act of 1995 (PSLRA), which statements may be identified by words such as "expects," "plans," "projects," "will," "may," "anticipates," "believes," "should," "intends," "estimates," and other words of similar meaning, including statements regarding the benefits resulting from the acquisition of PROLOR, including whether the Phase 3 clinical trials for hGH-CTP will be commenced or completed on a timely basis or at all, that earlier clinical results may not be reproducible or indicative of future results, that hGH-CTP and/or any of PROLOR's compounds under development may fail, may not achieve the expected results or effectiveness and may not generate data that would support the approval or marketing of products for the indications being studied or for other indications, that currently available products, as well as products under development by others, may prove to be as or more effective than PROLOR's products for the indications being studied, as well as other non-historical statements about our expectations, beliefs or intentions regarding our business, technologies and products, financial condition, strategies or prospects. Many factors could cause our actual activities or results to differ materially from the activities and results anticipated in forward-looking statements. These factors include those described in OPKO's and PROLOR's filings with the Securities and Exchange Commission, the ability to obtain regulatory approvals for the transaction on the proposed terms and schedule; the failure of OPKO's or PROLOR's stockholders to approve the transaction; the risk that a condition to closing of the merger may not be satisfied; the time required to consummate the proposed merger; the focus of management on merger-related issues; the risk that the businesses will not be integrated successfully; the risk that any potential synergies from the transaction may not be fully realized or may take longer to realize than expected; new information arising out of clinical trial results; and the risk that the safety and/or efficacy results of existing clinical trials will not support continued clinical development, as well as risks inherent in funding, developing and obtaining regulatory approvals of new, commercially-viable and competitive products and treatments. In addition, forward-looking statements may also be adversely affected by general market factors, competitive product development, product availability, federal and state regulations and legislation, the regulatory process for new products and indications, manufacturing issues that may arise, patent positions and litigation, among other factors. The forward- looking statements contained in this press release may become outdated over time. OPKO and PROLOR do not assume any responsibility for updating any forward-looking statements.

You may obtain copies of all documents filed with the SEC regarding this transaction, free of charge, at the SEC's website (www.sec.gov). You may also obtain these documents, free of charge, from OPKO's website (www.opko.com). You may also obtain these documents, free of charge, from PROLOR's website (www.prolor-biotech.com).

PARTICIPANTS IN THE MERGER SOLICITATION

PROLOR, OPKO and their respective directors and executive officers may be deemed to be participants in the solicitation of proxies from the stockholders of PROLOR and OPKO in connection with the proposed transaction. Information about PROLOR's directors and executive officers is set forth in its proxy statement for its 2012 Annual Meeting of Stockholders, which was filed with the SEC on April 24, 2012, and its Annual Report on Form 10-K for the year ended December 31, 2012, filed on March 15, 2013. These documents are available free of charge at the SEC's website at www.sec.gov, or by going to PROLOR's Investor Relations page on its corporate website at www.prolor-biotech.com. Information about OPKO's directors and executive officers is set forth in its proxy statement for its 2012 Annual Meeting of Stockholders, which was filed with the SEC on April 27, 2012, and its Annual Report on Form 10-K for the year ended December 31, 2012, filed on March 18, 2013. These documents are available free of charge at the SEC's website at www.sec.gov, or by going to OPKO's Investor Relations page on its corporate website at www.opko.com. Additional information regarding the interests of participants in the solicitation of proxies in connection with the transaction will be included in the joint proxy statement/prospectus.